EP4153889B1 - Segment racleur d'huile et ensemble segment de piston pour moteur à combustion interne - Google Patents

Segment racleur d'huile et ensemble segment de piston pour moteur à combustion interne Download PDF

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Publication number
EP4153889B1
EP4153889B1 EP21730482.3A EP21730482A EP4153889B1 EP 4153889 B1 EP4153889 B1 EP 4153889B1 EP 21730482 A EP21730482 A EP 21730482A EP 4153889 B1 EP4153889 B1 EP 4153889B1
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EP
European Patent Office
Prior art keywords
ring
recesses
oil scraper
oil
scraper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP21730482.3A
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German (de)
English (en)
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EP4153889A1 (fr
Inventor
Nigel Gray
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Federal Mogul Burscheid GmbH
Original Assignee
Federal Mogul Burscheid GmbH
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Publication of EP4153889A1 publication Critical patent/EP4153889A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • F16J9/206—One-piece oil-scraping rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/14—Joint-closures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings

Definitions

  • the present invention relates to an oil scraper ring and a piston ring set with such an oil scraper ring, which is to be used in an internal combustion engine, preferably in a 4-stroke engine.
  • the oil scraper ring includes an annular gap which is designed differently at the top and bottom, i.e. on the combustion chamber side and the crankcase side.
  • An oil scraper ring according to the prior art is e.g. B. known from JP H04 132260 U .
  • the present invention attempts to combine the advantage of small annular gaps in terms of oil stripping effect with a larger annular gap that prevents pressure build-up and second ring instability. Furthermore, the invention attempts to reduce an oil flow in the upward direction, i.e. towards the combustion chamber, during throttled operation or in overrun operation.
  • the present invention is particularly aimed at being effective in operating conditions in which the pressure in the combustion chamber falls below the ambient pressure, on the one hand to reduce the amount of oil that can get into the combustion chamber and at the same time to improve the stability of the second or middle (oil control) piston ring by reducing the gas pressure or gas pressure difference that builds up.
  • a larger effective gap at the top edge of the oil control ring allows freer gas flow under high load when the ring is pressed against the upper piston ring groove flank by mass or inertia forces.
  • the reduced amount of oil that can enter the combustion chamber means that less oil is burned, which in particular can reduce particulate emissions, especially after overrun operation.
  • the oil scraper ring according to the present invention has the features of current claim 1, further advantageous embodiments are described in the appended claims. According to a further aspect of the present invention, a piston ring set with an oil scraper ring according to the invention and a further oil control ring is described, which also has a special geometry of the annular gap.
  • the present oil scraper ring with an uneven annular gap is also designed to direct part of the blowby into the space between the two scraper webs of the piston ring, so that part of the blowby can flow inwards through radial openings in the oil scraper ring into the bottom of the annular groove, from where it is directed into the crankcase through oil drain channels or the underlying axial play.
  • the blow-by is reduced by the two compression rings above it to such an extent that such a discharge does not cause any significant problems.
  • This blow-by flow makes it possible, in particular, for oil droplets to be entrained from the gap between the two oil scraper webs and fed to the crankcase.
  • an oil scraper ring has a ring body which has an upper ring flank, a lower ring flank, an inner side of the ring located in the radial direction and an outer side of the ring located in the radial direction.
  • the ring body is provided with two butt ends, between which there is an annular gap. The butt ends have opposite butt surfaces.
  • the ring body is provided with at least one stripper bar on the outside of the ring.
  • the oil scraper ring according to the invention has two (opposite) recesses in the area of the abutting ends, each of which adjoins at least the outside of the ring, the respective abutting surface and the upper ring flank.
  • the respective recess thus extends in the area in which the one corner, which would have been formed from the surface of the ring outside or a web, the respective abutting surface and the upper ring flank, would be located.
  • the two opposite recesses located on both sides of the annular gap widen the annular gap, in particular between the edges of the upper stripper web.
  • One of the two recesses is arranged at each of the abutting ends.
  • the respective recess thus extends in the area of the surface of the ring outside or a web, the respective abutting surface and the upper ring flank.
  • the recess also extends in the area of an upper scraper web.
  • annular gap on the upper flank surface is larger by a factor of 2 to 5 than the annular gap in the installed state.
  • the recesses are designed symmetrically to a play plane, the abutting surfaces.
  • the mirror plane of the abutting surfaces is defined by the abutting surfaces, with a center point of the piston ring and the axial direction should lie in the mirror plane.
  • the ring body has two scraper webs, an upper scraper web on the combustion chamber side and a lower scraper web on the crankcase side.
  • the recess extends into an area of an upper scraper web.
  • the upper wiper ring is shorter in the circumferential direction than the lower wiper ring. This results in a larger annular gap on the upper scraper ring, whereby fuel gases can pass through the larger upper gap into the area between the scraper webs and from there can flow into the space behind the oil scraper ring via oil passages running in the radial direction.
  • oil droplets can be transported from the area between the scraper bars behind the oil scraper ring. Even when the piston moves downwards, the piston ring closes less tightly, which is why pressure equalization can take place through the oil drains in the oil scraper piston ring groove to the crankcase under all operating conditions.
  • the recess has the shape of part of a sphere, a cylinder, a cone or a cuboid.
  • the recess is therefore delimited by a part of a spherical surface, a cylindrical surface, a conical surface or a cuboid surface.
  • the recesses on the abutting surface further adjoin the inside of the ring.
  • the recesses on the abutment surfaces extend in the area in which the edge would extend between the abutment surface and the upper ring flank; the recesses in this embodiment form a passage in the radial direction from the inside of the ring to the outside of the ring.
  • blowby gases can get directly behind the ring.
  • the Oil scraper ring in the area spaced from the abutting ends with at least one further recess, which extends on the upper ring flank from the outside of the ring towards the inside of the ring.
  • this further recess ends before reaching the inside of the ring.
  • this at least one further recess extends to the inside of the ring and forms a channel in the radial direction.
  • At least one further recess or radial recess and the two recesses at the joint are evenly distributed over the circumference of the piston ring, with the two recesses at the joint being viewed as a recess that is divided by the joint.
  • the recesses are arranged at a distance of, for example, 180°, 120°, 90°, 60° or 30° from one another. Distributed accordingly for larger numbers of recesses.
  • the oil scraper ring is designed as a two-part oil scraper ring.
  • the oil scraper ring has a circumferential groove on the inside of the ring, into which at least one expander such as a tube spring is inserted.
  • this effect is ensured by a different selection of "rail" impact clearance.
  • an even number of further recesses or radial recesses are used. Due to the denser or closer arrangement to one another in the circumferential direction, the area of the ring back remains free of recesses, which means that the risk of ring breakage at the point most heavily loaded during ring assembly can be reduced.
  • the back of the ring remains free of recesses and the overall stability of the ring is improved.
  • the two recesses and the at least one radial recess each have different heights or depths in the axial direction, with the two recesses having a greatest depth (in the axial direction) directly at the annular gap.
  • the adjacent radial recesses have a smaller depth in the axial direction and finally the radial recesses that are arranged closest to the back of the ring are the flattest.
  • the two recesses or the at least one radial recess have a depth that is between 0.1 and 0.3 mm. The depth is measured in the axial direction.
  • the two recesses and/or the at least one radial recess are designed so that they do not interrupt the upper scraper ring.
  • a piston ring set with an oil scraper ring of the oil scraper rings described above and further at least one oil control ring (or middle piston ring) is provided, wherein a compression ring can preferably also be included.
  • the oil control ring comprises a control ring body which has an upper control ring flank, a lower control ring flank, an inner side of the control ring in the radial direction and an outer side of the control ring in the radial direction.
  • the control ring body is provided with two control butt ends, between which there is a control ring gap. The butt ends have opposite control butt surfaces.
  • the control ring is provided with two recesses in the area of the control joint ends, each of which adjoins at least the outside of the ring, the respective joint surface and the upper ring flank.
  • two piston rings are provided with recesses in the area of the respective joint, with the recesses at the joint widening towards one another.
  • FIG 1 shows a partial perspective view of a conventional oil scraper ring 2 in the area of an annular gap 18.
  • the conventional oil scraper ring 2 comprises a ring body 6 with an upper ring flank 8, a concealed lower ring flank, an inside of the ring that is also not visible and an outside of the ring 14.
  • the ring body 6 is interrupted at a joint, with two opposing butt surfaces 20 forming an annular gap 18 between them.
  • the annular gap dimensions are always considered in the installed state.
  • the ring body 6 is provided with at least one stripper web 24, 26 on the outside of the ring 14.
  • the oil scraper ring of the prior art and/or the invention can further be provided with oil passages which extend between the scraper webs from the outside of the ring towards the inside of the ring, but which are not shown for reasons of clarity.
  • FIG. 2 is a representation of a perspective partial view of an oil scraper ring 4 according to the invention in the area of the annular gap 18 with oblique recesses 28.
  • the oil scraper ring 4 according to the invention has an annular body 6.
  • the ring body comprises an upper ring flank 8, an invisible lower ring flank, a concealed inner ring side and an outer ring side 14.
  • the ring body 6 has an annular gap 18, which is delimited by two opposing abutment surfaces 20.
  • the ring body 6 has at least one stripper web 24, 26 on its ring outside 14 Mistake.
  • the oil scraper ring 4 has two recesses 28 in the area of the abutment surfaces 20, one on each abutment surface 20.
  • each of the recesses adjoins the outside of the ring 14, the respective abutment surface 20 and the upper ring flank 8.
  • the recesses each correspond approximately to a triangular prism.
  • blowby gases that have passed through at least two compression or oil control rings located above can flow into a space between the upper and lower scraper webs (24, 26). From there, the blowby gases can flow in the circumferential direction and flow inwards through oil passages (not shown) towards the bottom of the oil scraper ring groove, thereby entraining oil droplets. This makes it possible to return more oil towards the crankcase, with less oil able to get into the combustion chamber, particularly during overrun operation.
  • Figure 3 shows a partial view of an oil scraper ring according to the invention, except for the shape of the recesses 28 Figure 3 corresponds.
  • recesses are used here that are delimited by part of a conical surface. This shape allows the blowby gases to flow even better towards the space between the upper and lower scraper webs 24, 26.
  • Figure 4 shows another possibility of designing the shape of the recesses 28.
  • the other parts of the Figure 4 correspond to the Figures 2 and 3 .
  • the recesses 28 of the Figure 4 are limited by cuboid surfaces.
  • Figure 5 shows another possible embodiment of the annular gap 18 or the recesses 28.
  • the recesses 28 of Figure 5 limited by cuboid surfaces, with the recess extending completely through the oil scraper ring 4 in the radial direction.
  • the blowby gases can also flow directly through the recesses 24, 26 in the direction of the bottom of the annular groove.
  • Figure 6 is a version of an oil scraper ring in which the recesses of the Figure 4 can also be used in a location spaced from the annular gap and the abutting surfaces. These are referred to as radial recesses 34 in order to be able to distinguish them from the recesses in the annular gap.
  • the underlying principle is to achieve an improved flow from the outside to the inside through the oil scraper ring using blowby gases.
  • Figure 7 is the radial recess 34 Figure 6 only very flat, so that the radial recess 34 does not interrupt the upper stripper web 24 in the axial direction.
  • the Radial recess 34 in the Figure 7 extends in the radial direction only over part of the upper ring flank 8.
  • the radial recess 37 forms over the entire upper ring flank 8, so that the radial recess only forms a passage to a piston ring groove base with a positively twisted oil scraper ring. If the oil scraper ring is negatively twisted, the continuous edge between the inside of the ring and the upper ring flank rests on an upper oil scraper piston ring groove of a piston and a passage of oil in the radial direction is prevented.
  • Figure 8 is the radial recess 34 as in the Figure 7 only very flat, so that the radial recess 34 does not interrupt the upper stripper bar in the axial direction.
  • the radial recess 37 extends over the entire upper ring flank 8, so that the radial recess forms a passage to a piston ring groove base in every twist position of the oil scraper ring.
  • Figure 9 is the radial recess 34 Figure 6 extended to the inside of the ring.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Claims (13)

  1. Segment racleur d'huile (4) comportant un corps de segment (6)
    qui présente un flanc de segment supérieur (8),
    un flanc de segment inférieur,
    un côté de segment intérieur et
    un côté de segment extérieur (14),
    dans lequel le corps de segment (6) est pourvu de deux surfaces de butée opposées (20), entre lesquelles se trouve un interstice annulaire (18),
    dans lequel le corps de segment (6) est pourvu sur le côté de segment extérieur (14) d'au moins une bande racleuse (24, 26) et
    dans lequel le segment racleur d'huile (4) est pourvu au niveau de la zone des surfaces de butée (20) respectivement de deux évidements (28), qui jouxtent le côté de segment extérieur (14), la surface de butée (20) respective et le flanc de segment supérieur (8),
    caractérisé en ce que le segment racleur d'huile (4) est pourvu dans la zone espacée de l'interstice annulaire (18) d'au moins un autre évidement radial (34) qui s'étend sur le flanc de segment supérieur (8) depuis le côté de segment extérieur (14) vers le côté de segment intérieur.
  2. Segment racleur d'huile (4) selon la revendication 1, dans lequel les évidements (28) s'étendent symétriquement sur un plan de jeu des surfaces de butée (20).
  3. Segment racleur d'huile (4) selon la revendication 1 ou 2, dans lequel, dans un état installé, une largeur (30) de l'interstice annulaire (18) est définie comme une distance entre les surfaces de butée (20) dans la direction circonférentielle et dans lequel une largeur d'une somme de la largeur (32) des évidements (28) et de l'interstice annulaire (18) dans la direction circonférentielle d'un segment installé est plus grande d'un facteur de 2 à 5 que la largeur (30) de l'interstice annulaire.
  4. Segment racleur d'huile (4) selon la revendication 1, 2 ou 3, caractérisé en ce que le corps de segment (6) comporte deux bandes racleuses, une bande racleuse supérieure (24) et une bande racleuse inférieure (26), dans lequel l'évidement (28) s'étend jusque dans une région d'une bande racleuse supérieure (28), dans lequel la bande racleuse supérieure (24) est de préférence plus courte d'environ la largeur des évidements (32) que celle de la bande racleuse inférieure (26).
  5. Segment racleur d'huile (4) selon la revendication 1, 2, 3 ou 4, caractérisé en ce que l'évidement (28) est délimité par une partie d'une surface sphérique, une surface cylindrique, une surface conique ou une surface cuboïde.
  6. Segment racleur d'huile (4) selon une des revendications précédentes, caractérisé en ce que les évidements (28) sur la surface de butée (20) jouxtent en outre le côté intérieur de segment.
  7. Segment racleur d'huile (4) selon la revendication 1, caractérisé en ce que le au moins un évidement radial (34) s'étend vers le côté intérieur de segment.
  8. Segment racleur d'huile (4) selon une des revendications précédentes, caractérisé en ce que le au moins un évidement radial (34) et les deux évidements (28) sur l'interstice annulaire (18) sont répartis uniformément sur la circonférence du segment racleur d'huile (4).
  9. Segment racleur d'huile (4) selon une des revendications précédentes 1 à 7, caractérisé en ce que les deux évidements (28) resp. le au moins un évidement radial (34) sont disposés plus près de l'interstice annulaire (18) les uns des autres que sur un fond de segment, et dans lequel un nombre pair d'évidements radiaux (34) est de préférence utilisé.
  10. Segment racleur d'huile (4) selon une des revendications précédentes 1 à 9, caractérisé en ce que les deux évidements (28) et le au moins un évidement radial (34) les plus proches de l'interstice annulaire (18) présentent respectivement une profondeur qui diminue dans la direction circonférentielle vers le fond de segment.
  11. Segment racleur d'huile (4) selon une des revendications précédentes 1 à 10, caractérisé en ce que les deux évidements (28) resp. le au moins un évidement radial (34) présentent une profondeur comprise entre 0,1 et 0,3 mm.
  12. Segment racleur d'huile (4) selon une des revendications précédentes 1 à 11, caractérisé en ce que les deux évidements (28) et/ou le au moins un évidement radial (34) n'interrompent pas le segment racleur supérieur.
  13. Jeu de segments de piston (38) comportant un segment racleur d'huile (4) selon une des revendications 1 à 12, comprenant en outre au moins un segment de commande d'huile (40) avec un corps de segment de commande (42), qui présente
    un flanc de segment de commande supérieur (44),
    un flanc de segment de commande inférieur,
    un côté intérieur de segment de commande et
    un côté extérieur de segment de commande (50),
    dans lequel le corps de segment de commande (42) est pourvu d'un interstice de segment de commande (54), qui est situé entre des surfaces de butée de commande opposées (52), et
    dans lequel le segment de commande (40) est pourvu de deux évidements (56) au niveau des surfaces de butée de commande (52), qui jouxtent respectivement au moins le côté extérieur de segment (50), la surface de butée respective (25) et le flanc de segment inférieur.
EP21730482.3A 2020-08-06 2021-05-19 Segment racleur d'huile et ensemble segment de piston pour moteur à combustion interne Active EP4153889B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020120770.0A DE102020120770B3 (de) 2020-08-06 2020-08-06 Ölabstreifring und Kolbenringsatz für einen Verbrennungsmotor
PCT/EP2021/063305 WO2022028747A1 (fr) 2020-08-06 2021-05-19 Segment racleur d'huile et ensemble segment de piston pour moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP4153889A1 EP4153889A1 (fr) 2023-03-29
EP4153889B1 true EP4153889B1 (fr) 2024-03-06

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ID=76305861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21730482.3A Active EP4153889B1 (fr) 2020-08-06 2021-05-19 Segment racleur d'huile et ensemble segment de piston pour moteur à combustion interne

Country Status (7)

Country Link
US (1) US20230296173A1 (fr)
EP (1) EP4153889B1 (fr)
JP (1) JP2023537356A (fr)
KR (1) KR20230042473A (fr)
CN (1) CN116507835A (fr)
DE (1) DE102020120770B3 (fr)
WO (1) WO2022028747A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0254351U (fr) * 1988-10-12 1990-04-19
DE3924982C2 (de) 1989-07-28 1994-12-22 Man B & W Diesel Ag Kolbenring-System
DE4025868A1 (de) 1990-08-16 1992-02-20 Goetze Ag Kompressionskolbenring
JP2502335Y2 (ja) * 1991-05-28 1996-06-19 帝国ピストンリング株式会社 組合せオイルリング及びそれを装着したピストン
DE102009048503A1 (de) 2009-09-30 2011-03-31 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kolben für eine Brennkraftmaschine

Also Published As

Publication number Publication date
DE102020120770B3 (de) 2021-09-16
EP4153889A1 (fr) 2023-03-29
JP2023537356A (ja) 2023-08-31
CN116507835A (zh) 2023-07-28
WO2022028747A1 (fr) 2022-02-10
KR20230042473A (ko) 2023-03-28
US20230296173A1 (en) 2023-09-21

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